Show blocked counts on the Blocking page, and reveal + CNAME on hover

The Blocking page shows how many queries each blocklist, and the rules
together, blocked in the last 24 hours (with statistics on). The + CNAME
button on A/AAAA rows shows when the row is hovered or focused, and
always on touch screens.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/web/static/assets/style.css

@@ -320,6 +320,12 @@ td.break { word-break: break-all; }
 }
 
 .refreshing { opacity: 0.6; transition: opacity 0.2s; }
+/* Secondary row actions show when the row is hovered or focused; touch
+   screens, which can't hover, always show them. Opacity keeps them in the
+   layout (no shifting) and reachable with Tab. */
+tr .reveal { opacity: 0; transition: opacity 0.1s; }
+tr:hover .reveal, tr:focus-within .reveal { opacity: 1; }
+@media (hover: none) { tr .reveal { opacity: 1; } }
 h2.section { margin: 24px 0 10px; font-size: 18px; }
 .filter-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
 .segmented { display: inline-flex; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--panel); }